RFC 1479 (rfc1479) - Page 3 of 108

Inter-Domain Policy Routing Protocol Specification: Version 1

Alternative Format: Original Text Document
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RFC 1479                     IDPR Protocol                     July 1993


   6.1.1. Implementation. . . . . . . . . . . . . . . . . . . . . . .75
   6.2. Route Directionality. . . . . . . . . . . . . . . . . . . . .78
   6.3. Route Database. . . . . . . . . . . . . . . . . . . . . . . .79
   6.3.1. Cache Maintenance . . . . . . . . . . . . . . . . . . . . .80
   7. Path Control Protocol and Data Message Forwarding Procedure . .80
   7.1. An Example of Path Setup. . . . . . . . . . . . . . . . . . .81
   7.2. Path Identifiers. . . . . . . . . . . . . . . . . . . . . . .84
   7.3. Path Control Messages . . . . . . . . . . . . . . . . . . . .85
   7.4. Setting Up and Tearing Down a Path. . . . . . . . . . . . . .87
   7.4.1. Validating Path Identifiers . . . . . . . . . . . . . . . .89
   7.4.2. Path Consistency with Configured Transit Policies . . . . .89
   7.4.3. Path Consistency with Virtual Gateway Reachability. . . . .91
   7.4.4. Obtaining Resources . . . . . . . . . . . . . . . . . . . .92
   7.4.5. Target Response . . . . . . . . . . . . . . . . . . . . . .93
   7.4.6. Originator Response . . . . . . . . . . . . . . . . . . . .93
   7.4.7. Path Life . . . . . . . . . . . . . . . . . . . . . . . .  94
   7.5. Path Failure and Recovery . . . . . . . . . . . . . . . . .  95
   7.5.1. Handling Implicit Path Failures . . . . . . . . . . . . .  96
   7.5.2. Local Path Repair . . . . . . . . . . . . . . . . . . . .  97
   7.5.3. Repairing a Path. . . . . . . . . . . . . . . . . . . . .  98
   7.6. Path Control Message Formats. . . . . . . . . . . . . . . . 100
   7.6.1. SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . 101
   7.6.2. ACCEPT. . . . . . . . . . . . . . . . . . . . . . . . . . 103
   7.6.3. REFUSE. . . . . . . . . . . . . . . . . . . . . . . . . . 103
   7.6.4. TEARDOWN. . . . . . . . . . . . . . . . . . . . . . . . . 104
   7.6.5. ERROR . . . . . . . . . . . . . . . . . . . . . . . . . . 105
   7.6.6. REPAIR. . . . . . . . . . . . . . . . . . . . . . . . . . 106
   7.6.7. Negative Acknowledgements . . . . . . . . . . . . . . . . 106
   8. Security Considerations . . . . . . . . . . . . . . . . . . . 106
   9. Authors's Address . . . . . . . . . . . . . . . . . . . . . . 107
   References . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

1.  Introduction

   In this document, we specify the protocols and procedures that
   compose Inter-Domain Policy Routing (IDPR).  The objective of IDPR is
   to construct and maintain routes between source and destination
   administrative domains, that provide user traffic with the services
   requested within the constraints stipulated for the domains
   transited.  IDPR supports link state routing information distribution
   and route generation in conjunction with source specified message
   forwarding.  Refer to [5] for a detailed justification of our
   approach to inter-domain policy routing.

1.1.  Domain Elements

   The IDPR architecture has been designed to accommodate an
   internetwork with tens of thousands of administrative domains



Steenstrup
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